Total drainage volume by a group of wells.
It is going to be the same as Potential drainage volume of each well of a group if all wells in a group are draining the same pack of reservoirs.
See also
Physics / Fluid Dynamics / Percolation
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Field Study & Modelling / Drainage (fluid flow)
[ Drainage area (Ae) ] [ Drainage radius (re) ]